<template >
  <div>
    <!-- 面包屑导航区： -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品区域" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条区 -->
      <el-steps :space="300" :active="activeIndex -0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cascaderProps"
                @change="handleChange"
                clearable
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="tag" v-for="(tag,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传的后台API地址,headers给他绑定一个请求头传递token -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button type="primary">
                上传
                <i class="el-icon-upload el-icon--right" size="small"></i>
              </el-button>

              <!-- <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div> -->
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor ref="myQuillEditor" v-model="addForm.goods_introduce" />
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btn_add" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
import _ from "lodash";
export default {
  data() {
    return {
      activeIndex: 0,
      //   添加商品的表单对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片数组：
        pics: [],
        // 商品的详情描述
        goods_introduce: "",
        // 参数列表：
        attrs: []
      },
      //   添加商品的表单验证规则：
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" }
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" }
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" }
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" }
        ],
        goods_cat: [
          { required: true, message: "请选择分类名称", trigger: "blur" }
        ]
      },
      //   商品分类列表：
      catelist: [],
      //指定级联选择器的配置对象
      cascaderProps: {
        expandTrigger: "hover",
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      //   动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据：
      onlyTableData: [],
      // 上传图片的接口地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",
      // 图片上传的header
      headerObj: {
        Authorization: window.sessionStorage.getItem("token")
      },
      previewPath: "",
      previewVisible: false
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      this.catelist = res.data;
      console.log(this.catelist);
    },
    // 级联选择器变化出发的函数
    handleChange() {
      console.log(this.addForm.goods_cat);
      //   如果没有选择三级分类：
      if (this.addForm.goods_cat.length !== 3) {
        //   直接清空
        this.addForm.goods_cat = [];
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择商品分类");
        return false;
      }
    },
    async tabClicked() {
      console.log(this.activeIndex);
      //   证明访问的是动态参数面板
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: {
              sel: "many"
            }
          }
        );
        console.log(res.data);
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ");
        });
        this.manyTableData = res.data;
      } else if (this.activeIndex === "2") {
        // 访问的是静态属性判断
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: {
              sel: "only"
            }
          }
        );
        console.log(res.data);
        this.onlyTableData = res.data;
      }
    },
    // 图片预览效果：
    handlePreview(file) {
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    // 处理移除图片的操作
    handleRemove(file) {
      console.log(file);
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path;
      // 2.从pics数组好难过，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => {
        x.pic === filePath;
      });
      // 3.调用数组的splice方法，把图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1);
      console.log(this.addForm);
    },
    // 监听图片上传成功的事件：
    handleSuccess(res) {
      console.log(res);
      // 拼接得到一个信息对象
      const picInfo = {
        pic: res.data.tmp_path
      };
      // 把图片对象信息加入到pics数组中
      this.addForm.pics.push(picInfo);
      console.log(this.addForm);
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(valid => {
        if (!valid) {
          return this.$message.error("请填写必要的表单项!");
        }
        // 执行添加商品
        // 因为级联选择器不允许改变数组成字符串，所以需要执行深拷贝表单对象：使用lodash cloneDeep(obj)
        const form = _.cloneDeep(this.addForm);
        form.goods_cat = form.goods_cat.join(",");
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" ")
          };
          this.addForm.attrs.push(newInfo);
        });
        // 处理静态属性：
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          };
          this.addForm.attrs.push(newInfo);
        });
        form.attrs = this.addForm.attrs;
        console.log(form);
        // 发起请求添加商品
        this.$http.post("goods", form).then(res => {
          this.$message.success("添加商品成功!");
          this.$router.push("/goods");
        });
      });
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    }
  }
};
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btn_add {
  margin-top: 15px;
}
</style>